The underground fracturing tool string for coal mines is a core piece of equipment designed to address requirements such as enhancing permeability through coalbed methane extraction, weakening hard roof strata, and preventing rock bursts. Typically comprising components including packers, safety release devices, directional chokes, check valves, and guide shoes arranged in series, it achieves directional perforation, staged fracturing, and fracture support through coordinated operation. Constructed from high-strength alloy steel with corrosion-resistant coatings, the tool string withstands high-pressure, humid, and flammable/explosive underground conditions. Additionally, it incorporates rapid debloating capabilities: lateral flushing devices and low-density balls flush out rock debris, resolving jamming issues and shortening operational cycles. This integrated tool string combines efficient rock fracturing with safety protection, providing critical technological support for coal mine hazard prevention and efficient resource extraction.